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x in (-oo:+oo)
y-4 = (5/9)*(x-10) // - (5/9)*(x-10)
y-((5/9)*(x-10))-4 = 0
(-5/9)*(x-10)+y-4 = 0
y-5/9*(x-10)-4 = 0
y-5/9*(x-10)-4 = 0
y-5/9*x-4+50/9 = 0
y-5/9*x+14/9 = 0
y-5/9*x+14/9 = 0
y-5/9*x+14/9 = 0 // - y+14/9
-5/9*x = -(y+14/9) // : -5/9
x = (-(y+14/9))/(-5/9)
x = 9/5*(y+14/9)
x = 9/5*(y+14/9)
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